The Master of Keys (Commander) - Optimized Combo

Background image for What if Thassa's Oracle Were Banned?
Harvey McGuinness
Sep 23, 2025
What if Thassa's Oracle Were Banned?
What would happen to cEDH if Thassa's Oracle were banned tomorrow? Would the best decks fall apart? Would there be a new meta? Let's discuss.
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Animate Dead
85%inclusion29 decks34 decks
76%synergy
Necromancy
74%inclusion25 decks34 decks
69%synergy
Abdel Adrian, Gorion's Ward
71%inclusion24 decks34 decks
69%synergy
Ripples of Undeath
62%inclusion21 decks34 decks
59%synergy
Mystic Remora
76%inclusion26 decks34 decks
55%synergy
Entomb
62%inclusion21 decks34 decks
55%synergy
Sevinne's Reclamation
62%inclusion21 decks34 decks
53%synergy
Tinybones Joins Up
47%inclusion16 decks34 decks
46%synergy
Dark Ritual
65%inclusion22 decks34 decks
45%synergy
Dress Down
47%inclusion16 decks34 decks
45%synergy
Top Cards
Swords to Plowshares
65%inclusion22 decks34 decks
-4%synergy
Esper Sentinel
59%inclusion20 decks34 decks
31%synergy
An Offer You Can't Refuse
53%inclusion18 decks34 decks
26%synergy
Blind Obedience
53%inclusion18 decks34 decks
41%synergy
Swan Song
53%inclusion18 decks34 decks
33%synergy
The Meathook Massacre
47%inclusion16 decks34 decks
44%synergy
Windfall
44%inclusion15 decks34 decks
31%synergy
Lotho, Corrupt Shirriff
44%inclusion15 decks34 decks
27%synergy
Dance of the Dead
41%inclusion14 decks34 decks
39%synergy
Mirrormade
41%inclusion14 decks34 decks
31%synergy
Game Changers
Rhystic Study
76%inclusion26 decks34 decks
45%synergy
Smothering Tithe
71%inclusion24 decks34 decks
39%synergy
Demonic Tutor
65%inclusion22 decks34 decks
44%synergy
Enlightened Tutor
65%inclusion22 decks34 decks
45%synergy
Vampiric Tutor
65%inclusion22 decks34 decks
47%synergy
Thassa's Oracle
50%inclusion17 decks34 decks
40%synergy
Necropotence
47%inclusion16 decks34 decks
40%synergy
Ancient Tomb
44%inclusion15 decks34 decks
31%synergy
The One Ring
44%inclusion15 decks34 decks
31%synergy
Force of Will
41%inclusion14 decks34 decks
28%synergy
Creatures
Entity Tracker
41%inclusion14 decks34 decks
35%synergy
Valley Floodcaller
38%inclusion13 decks34 decks
34%synergy
Orcish Bowmasters
38%inclusion13 decks34 decks
27%synergy
Inquisitive Glimmer
35%inclusion12 decks34 decks
28%synergy
Mesa Enchantress
35%inclusion12 decks34 decks
26%synergy
Grim Guardian
32%inclusion11 decks34 decks
30%synergy
Grand Abolisher
32%inclusion11 decks34 decks
18%synergy
Displacer Kitten
29%inclusion10 decks34 decks
22%synergy
Hullbreaker Horror
29%inclusion10 decks34 decks
23%synergy
Ledger Shredder
29%inclusion10 decks34 decks
21%synergy
Scrabbling Skullcrab
26%inclusion9 decks34 decks
25%synergy
Opposition Agent
26%inclusion9 decks34 decks
18%synergy
Archivist of Oghma
24%inclusion8 decks34 decks
17%synergy
Gravebreaker Lamia
24%inclusion8 decks34 decks
23%synergy
Demon of Fate's Design
24%inclusion8 decks34 decks
18%synergy
Fear of Impostors
24%inclusion8 decks34 decks
22%synergy
Overlord of the Balemurk
24%inclusion8 decks34 decks
22%synergy
Leonin Relic-Warder
24%inclusion8 decks34 decks
23%synergy
Talion, the Kindly Lord
24%inclusion8 decks34 decks
15%synergy
Voice of Victory
23%inclusion7 decks31 decks
14%synergy
Wan Shi Tong, Librarian
22%inclusion2 decks9 decks
17%synergy
Starfield Mystic
21%inclusion7 decks34 decks
14%synergy
Overlord of the Floodpits
21%inclusion7 decks34 decks
17%synergy
Lurrus of the Dream-Den
21%inclusion7 decks34 decks
19%synergy
Hedron Crab
21%inclusion7 decks34 decks
20%synergy
Victor, Valgavoth's Seneschal
21%inclusion7 decks34 decks
19%synergy
Mockingbird
21%inclusion7 decks34 decks
16%synergy
Zur, Eternal Schemer
21%inclusion7 decks34 decks
17%synergy
Psychic Frog
21%inclusion7 decks34 decks
14%synergy
Snapcaster Mage
18%inclusion6 decks34 decks
16%synergy
Laboratory Maniac
18%inclusion6 decks34 decks
14%synergy
Ranger-Captain of Eos
18%inclusion6 decks34 decks
11%synergy
Ondu Spiritdancer
18%inclusion6 decks34 decks
11%synergy
Phyrexian Metamorph
15%inclusion5 decks34 decks
6%synergy
Moon-Blessed Cleric
15%inclusion5 decks34 decks
10%synergy
Enduring Curiosity
15%inclusion5 decks34 decks
7%synergy
Fear of Sleep Paralysis
15%inclusion5 decks34 decks
9%synergy
Gremlin Tamer
15%inclusion5 decks34 decks
14%synergy
Balemurk Leech
15%inclusion5 decks34 decks
14%synergy
Faerie Mastermind
15%inclusion5 decks34 decks
5%synergy
Drannith Magistrate
15%inclusion5 decks34 decks
7%synergy
Heliod, the Radiant Dawn
15%inclusion5 decks34 decks
11%synergy
Ghostly Pilferer
15%inclusion5 decks34 decks
7%synergy
Witch Enchanter
12%inclusion4 decks34 decks
5%synergy
Hoarding Broodlord
12%inclusion4 decks34 decks
10%synergy
Sheoldred, the Apocalypse
12%inclusion4 decks34 decks
3%synergy
Walking Ballista
12%inclusion4 decks34 decks
9%synergy
Heliod, Sun-Crowned
12%inclusion4 decks34 decks
8%synergy
Doomwake Giant
12%inclusion4 decks34 decks
6%synergy
Ghostly Dancers
12%inclusion4 decks34 decks
9%synergy
Instants
Force of Negation
41%inclusion14 decks34 decks
29%synergy
Mystical Tutor
41%inclusion14 decks34 decks
30%synergy
Silence
38%inclusion13 decks34 decks
28%synergy
Path to Exile
38%inclusion13 decks34 decks
-4%synergy
Cyclonic Rift
38%inclusion13 decks34 decks
14%synergy
Gifts Ungiven
35%inclusion12 decks34 decks
33%synergy
Cabal Ritual
32%inclusion11 decks34 decks
29%synergy
Mana Drain
32%inclusion11 decks34 decks
15%synergy
Flusterstorm
32%inclusion11 decks34 decks
24%synergy
Sink into Stupor
32%inclusion11 decks34 decks
20%synergy
Counterspell
32%inclusion11 decks34 decks
-9%synergy
Demonic Consultation
29%inclusion10 decks34 decks
21%synergy
Fierce Guardianship
29%inclusion10 decks34 decks
9%synergy
Teferi's Protection
24%inclusion8 decks34 decks
7%synergy
Borne Upon a Wind
24%inclusion8 decks34 decks
19%synergy
Pact of Negation
24%inclusion8 decks34 decks
16%synergy
Mental Misstep
21%inclusion7 decks34 decks
14%synergy
Dovin's Veto
21%inclusion7 decks34 decks
-5%synergy
Retraction Helix
21%inclusion7 decks34 decks
20%synergy
Into the Flood Maw
21%inclusion7 decks34 decks
17%synergy
Arcane Denial
21%inclusion7 decks34 decks
0%synergy
Muddle the Mixture
18%inclusion6 decks34 decks
14%synergy
Tainted Pact
18%inclusion6 decks34 decks
10%synergy
Brainstorm
18%inclusion6 decks34 decks
1%synergy
Intuition
18%inclusion6 decks34 decks
16%synergy
Mindbreak Trap
18%inclusion6 decks34 decks
11%synergy
Void Rend
18%inclusion6 decks34 decks
-16%synergy
Deadly Rollick
15%inclusion5 decks34 decks
0%synergy
Sacrifice
12%inclusion4 decks34 decks
11%synergy
Brain Freeze
12%inclusion4 decks34 decks
11%synergy
Culling the Weak
12%inclusion4 decks34 decks
10%synergy
Banishing Knack
12%inclusion4 decks34 decks
11%synergy
Strix Serenade
12%inclusion4 decks34 decks
8%synergy
Waterlogged Teachings
12%inclusion4 decks34 decks
7%synergy
Fell the Profane
8.8%inclusion3 decks34 decks
0%synergy
Frantic Search
8.8%inclusion3 decks34 decks
-9%synergy
Chain of Vapor
8.8%inclusion3 decks34 decks
5%synergy
Negate
8.8%inclusion3 decks34 decks
-8%synergy
Dawn's Truce
8.8%inclusion3 decks34 decks
4%synergy
Angel's Grace
8.8%inclusion3 decks34 decks
6%synergy
Dispel
8.8%inclusion3 decks34 decks
5%synergy
Perplex
8.8%inclusion3 decks34 decks
8%synergy
Ad Nauseam
8.8%inclusion3 decks34 decks
6%synergy
Saw in Half
8.8%inclusion3 decks34 decks
7%synergy
Drown in the Loch
5.9%inclusion2 decks34 decks
4%synergy
Orim's Chant
5.9%inclusion2 decks34 decks
4%synergy
Clutch of the Undercity
5.9%inclusion2 decks34 decks
6%synergy
Lim-Dûl's Vault
5.9%inclusion2 decks34 decks
3%synergy
Darkblast
5.9%inclusion2 decks34 decks
6%synergy
Opt
5.9%inclusion2 decks34 decks
2%synergy
Sorceries
Toxic Deluge
38%inclusion13 decks34 decks
19%synergy
Reanimate
32%inclusion11 decks34 decks
16%synergy
Lively Dirge
18%inclusion6 decks34 decks
16%synergy
Imperial Seal
18%inclusion6 decks34 decks
10%synergy
Unmarked Grave
15%inclusion5 decks34 decks
13%synergy
Demonic Counsel
15%inclusion5 decks34 decks
14%synergy
Damn
15%inclusion5 decks34 decks
-6%synergy
Idyllic Tutor
12%inclusion4 decks34 decks
8%synergy
Supreme Verdict
8.8%inclusion3 decks34 decks
-6%synergy
Yawgmoth's Will
8.8%inclusion3 decks34 decks
7%synergy
Farewell
8.8%inclusion3 decks34 decks
-4%synergy
Beseech the Mirror
8.8%inclusion3 decks34 decks
5%synergy
Traumatize
8.8%inclusion3 decks34 decks
8%synergy
Cabal Therapy
5.9%inclusion2 decks34 decks
6%synergy
Diabolic Intent
5.9%inclusion2 decks34 decks
1%synergy
Resurgent Belief
5.9%inclusion2 decks34 decks
4%synergy
Diabolic Tutor
5.9%inclusion2 decks34 decks
1%synergy
Gitaxian Probe
5.9%inclusion2 decks34 decks
4%synergy
Repay in Kind
5.9%inclusion2 decks34 decks
6%synergy
Torment of Hailfire
5.9%inclusion2 decks34 decks
5%synergy
Wrath of God
5.9%inclusion2 decks34 decks
2%synergy
Dread Return
5.9%inclusion2 decks34 decks
3%synergy
Cut Your Losses
5.9%inclusion2 decks34 decks
6%synergy
Feed the Swarm
5.9%inclusion2 decks34 decks
3%synergy
Doomsday
5.9%inclusion2 decks34 decks
5%synergy
Buried Alive
5.9%inclusion2 decks34 decks
2%synergy
Vanquish the Horde
5.9%inclusion2 decks34 decks
3%synergy
Mnemonic Betrayal
5.9%inclusion2 decks34 decks
3%synergy
Day of Judgment
5.9%inclusion2 decks34 decks
4%synergy
Unburial Rites
5.9%inclusion2 decks34 decks
3%synergy
Damnation
5.9%inclusion2 decks34 decks
3%synergy
Grim Tutor
5.9%inclusion2 decks34 decks
2%synergy
Dance of the Manse
5.9%inclusion2 decks34 decks
2%synergy
Singularity Rupture
5.0%inclusion1 decks20 decks
3%synergy
Utility Artifacts
Wishclaw Talisman
38%inclusion13 decks34 decks
30%synergy
Mesmeric Orb
26%inclusion9 decks34 decks
25%synergy
Sensei's Divining Top
21%inclusion7 decks34 decks
11%synergy
Altar of the Brood
12%inclusion4 decks34 decks
10%synergy
Bolas's Citadel
8.8%inclusion3 decks34 decks
-1%synergy
Expedition Map
8.8%inclusion3 decks34 decks
7%synergy
Isochron Scepter
8.8%inclusion3 decks34 decks
7%synergy
Marina Vendrell's Grimoire
5.9%inclusion2 decks34 decks
5%synergy
Crucible of Worlds
5.9%inclusion2 decks34 decks
5%synergy
Mirror of Fate
5.9%inclusion2 decks34 decks
6%synergy
Aetherflux Reservoir
5.9%inclusion2 decks34 decks
-2%synergy
Mirage Mirror
5.9%inclusion2 decks34 decks
5%synergy
Agatha's Soul Cauldron
5.9%inclusion2 decks34 decks
5%synergy
Lightning Greaves
5.9%inclusion2 decks34 decks
-17%synergy
Codex Shredder
5.9%inclusion2 decks34 decks
6%synergy
Tainted Sigil
5.9%inclusion2 decks34 decks
6%synergy
Enchantments
Amphibian Downpour
41%inclusion14 decks34 decks
37%synergy
Propaganda
32%inclusion11 decks34 decks
5%synergy
Static Prison
29%inclusion10 decks34 decks
29%synergy
Touch the Spirit Realm
26%inclusion9 decks34 decks
24%synergy
Seal of Cleansing
26%inclusion9 decks34 decks
25%synergy
Ghostly Prison
26%inclusion9 decks34 decks
5%synergy
Enchanted Evening
24%inclusion8 decks34 decks
22%synergy
Trouble in Pairs
24%inclusion8 decks34 decks
18%synergy
Secret Arcade // Dusty Parlor
21%inclusion7 decks34 decks
16%synergy
Grasp of Fate
18%inclusion6 decks34 decks
11%synergy
Court of Cunning
18%inclusion6 decks34 decks
17%synergy
Out of the Tombs
18%inclusion6 decks34 decks
17%synergy
Estrid's Invocation
18%inclusion6 decks34 decks
13%synergy
Sphere of Safety
18%inclusion6 decks34 decks
8%synergy
Teval's Judgment
16%inclusion5 decks31 decks
15%synergy
Stillness in Motion
16%inclusion5 decks31 decks
16%synergy
Starfield of Nyx
15%inclusion5 decks34 decks
11%synergy
Counterbalance
12%inclusion4 decks34 decks
10%synergy
Founding the Third Path
12%inclusion4 decks34 decks
12%synergy
Authority of the Consuls
12%inclusion4 decks34 decks
0%synergy
Cemetery Tampering
12%inclusion4 decks34 decks
11%synergy
Leyline of Anticipation
12%inclusion4 decks34 decks
7%synergy
Black Market Connections
12%inclusion4 decks34 decks
-3%synergy
Bloodchief Ascension
12%inclusion4 decks34 decks
6%synergy
Nowhere to Run
12%inclusion4 decks34 decks
11%synergy
Dollmaker's Shop // Porcelain Gallery
12%inclusion4 decks34 decks
11%synergy
Greater Auramancy
12%inclusion4 decks34 decks
7%synergy
Seal of Removal
12%inclusion4 decks34 decks
11%synergy
Sigil of the Empty Throne
8.8%inclusion3 decks34 decks
3%synergy
Hopeless Nightmare
8.8%inclusion3 decks34 decks
9%synergy
Copy Artifact
8.8%inclusion3 decks34 decks
8%synergy
All That Glitters
8.8%inclusion3 decks34 decks
0%synergy
Chthonian Nightmare
8.8%inclusion3 decks34 decks
8%synergy
Solitary Confinement
8.8%inclusion3 decks34 decks
7%synergy
Hallowed Haunting
8.8%inclusion3 decks34 decks
6%synergy
Mirror Room // Fractured Realm
8.8%inclusion3 decks34 decks
7%synergy
Aura of Silence
8.8%inclusion3 decks34 decks
6%synergy
Phyrexian Arena
8.8%inclusion3 decks34 decks
-5%synergy
Endless Evil
5.9%inclusion2 decks34 decks
6%synergy
Parallax Wave
5.9%inclusion2 decks34 decks
6%synergy
Cacophony Unleashed
5.9%inclusion2 decks34 decks
4%synergy
Imprisoned in the Moon
5.9%inclusion2 decks34 decks
-1%synergy
Extravagant Replication
5.9%inclusion2 decks34 decks
1%synergy
Utter Insignificance
5.9%inclusion2 decks34 decks
5%synergy
Opalescence
5.9%inclusion2 decks34 decks
5%synergy
Lich
5.9%inclusion2 decks34 decks
6%synergy
Phyrexian Unlife
5.9%inclusion2 decks34 decks
4%synergy
Followed Footsteps
5.9%inclusion2 decks34 decks
5%synergy
Copy Enchantment
5.9%inclusion2 decks34 decks
1%synergy
Shark Typhoon
5.9%inclusion2 decks34 decks
0%synergy
Planeswalkers
Teferi, Time Raveler
32%inclusion11 decks34 decks
24%synergy
Jace, Wielder of Mysteries
5.9%inclusion2 decks34 decks
4%synergy
Narset, Parter of Veils
5.9%inclusion2 decks34 decks
2%synergy
Utility Lands
Hall of Heliod's Generosity
41%inclusion14 decks34 decks
28%synergy
Otawara, Soaring City
41%inclusion14 decks34 decks
22%synergy
Urza's Saga
35%inclusion12 decks34 decks
23%synergy
Cephalid Coliseum
26%inclusion9 decks34 decks
23%synergy
Emergence Zone
24%inclusion8 decks34 decks
21%synergy
Urborg, Tomb of Yawgmoth
24%inclusion8 decks34 decks
10%synergy
Takenuma, Abandoned Mire
21%inclusion7 decks34 decks
14%synergy
Serra's Sanctum
15%inclusion5 decks34 decks
13%synergy
Bojuka Bog
12%inclusion4 decks34 decks
-15%synergy
Reliquary Tower
12%inclusion4 decks34 decks
-22%synergy
Shizo, Death's Storehouse
8.8%inclusion3 decks34 decks
7%synergy
Minamo, School at Water's Edge
8.8%inclusion3 decks34 decks
5%synergy
Mistrise Village
6.5%inclusion2 decks31 decks
3%synergy
Maze of Ith
5.9%inclusion2 decks34 decks
3%synergy
Cabal Coffers
5.9%inclusion2 decks34 decks
3%synergy
Eiganjo, Seat of the Empire
5.9%inclusion2 decks34 decks
1%synergy
Academy Ruins
5.9%inclusion2 decks34 decks
-1%synergy
Mana Artifacts
Sol Ring
100%inclusion34 decks34 decks
10%synergy
Arcane Signet
94%inclusion32 decks34 decks
6%synergy
Talisman of Dominance
82%inclusion28 decks34 decks
33%synergy
Talisman of Progress
62%inclusion21 decks34 decks
18%synergy
Talisman of Hierarchy
56%inclusion19 decks34 decks
12%synergy
Fellwar Stone
50%inclusion17 decks34 decks
16%synergy
Mana Vault
35%inclusion12 decks34 decks
26%synergy
Chrome Mox
35%inclusion12 decks34 decks
26%synergy
Lotus Petal
29%inclusion10 decks34 decks
19%synergy
Mox Opal
26%inclusion9 decks34 decks
18%synergy
Mox Diamond
21%inclusion7 decks34 decks
13%synergy
Mox Amber
18%inclusion6 decks34 decks
11%synergy
Azorius Signet
15%inclusion5 decks34 decks
-17%synergy
Dimir Signet
12%inclusion4 decks34 decks
-20%synergy
Mind Stone
12%inclusion4 decks34 decks
-1%synergy
Orzhov Signet
12%inclusion4 decks34 decks
-22%synergy
Lion's Eye Diamond
12%inclusion4 decks34 decks
10%synergy
Commander's Sphere
5.9%inclusion2 decks34 decks
-13%synergy
Grim Monolith
5.9%inclusion2 decks34 decks
2%synergy
Basalt Monolith
5.9%inclusion2 decks34 decks
4%synergy
Lands
Command Tower
94%inclusion32 decks34 decks
2%synergy
Island
85%inclusion29 decks34 decks
-7%synergy
Swamp
82%inclusion28 decks34 decks
-9%synergy
Plains
82%inclusion28 decks34 decks
-9%synergy
Watery Grave
82%inclusion28 decks34 decks
32%synergy
Flooded Strand
76%inclusion26 decks34 decks
38%synergy
Godless Shrine
74%inclusion25 decks34 decks
23%synergy
Polluted Delta
74%inclusion25 decks34 decks
36%synergy
Hallowed Fountain
74%inclusion25 decks34 decks
24%synergy
Marsh Flats
71%inclusion24 decks34 decks
34%synergy
Exotic Orchard
65%inclusion22 decks34 decks
6%synergy
Sea of Clouds
56%inclusion19 decks34 decks
20%synergy
Morphic Pool
50%inclusion17 decks34 decks
16%synergy
Raffine's Tower
47%inclusion16 decks34 decks
6%synergy
Vault of Champions
44%inclusion15 decks34 decks
11%synergy
Tundra
41%inclusion14 decks34 decks
25%synergy
Glacial Fortress
38%inclusion13 decks34 decks
-3%synergy
Undercity Sewers
38%inclusion13 decks34 decks
24%synergy
Caves of Koilos
38%inclusion13 decks34 decks
3%synergy
Underground Sea
38%inclusion13 decks34 decks
22%synergy
Isolated Chapel
38%inclusion13 decks34 decks
-1%synergy
Underground River
38%inclusion13 decks34 decks
5%synergy
Scrubland
35%inclusion12 decks34 decks
19%synergy
City of Brass
35%inclusion12 decks34 decks
20%synergy
Shadowy Backstreet
32%inclusion11 decks34 decks
20%synergy
Sink into Stupor
32%inclusion11 decks34 decks
20%synergy
Meticulous Archive
32%inclusion11 decks34 decks
19%synergy
Adarkar Wastes
32%inclusion11 decks34 decks
1%synergy
Drowned Catacomb
29%inclusion10 decks34 decks
-7%synergy
Mana Confluence
29%inclusion10 decks34 decks
16%synergy
Bloodstained Mire
29%inclusion10 decks34 decks
18%synergy
Verdant Catacombs
26%inclusion9 decks34 decks
16%synergy
Gemstone Caverns
26%inclusion9 decks34 decks
19%synergy
Gloomlake Verge
24%inclusion8 decks34 decks
12%synergy
Misty Rainforest
21%inclusion7 decks34 decks
9%synergy
Prairie Stream
21%inclusion7 decks34 decks
-20%synergy
Windswept Heath
18%inclusion6 decks34 decks
8%synergy
Arcane Sanctum
18%inclusion6 decks34 decks
-37%synergy
Arid Mesa
18%inclusion6 decks34 decks
8%synergy
Floodfarm Verge
18%inclusion6 decks34 decks
6%synergy
Fabled Passage
15%inclusion5 decks34 decks
7%synergy
Scalding Tarn
15%inclusion5 decks34 decks
4%synergy
Witch Enchanter
12%inclusion4 decks34 decks
5%synergy
Brightclimb Pathway
12%inclusion4 decks34 decks
5%synergy
Bleachbone Verge
12%inclusion4 decks34 decks
3%synergy
Temple of Deceit
12%inclusion4 decks34 decks
-6%synergy
Shipwreck Marsh
12%inclusion4 decks34 decks
-9%synergy
Valgavoth's Lair
12%inclusion4 decks34 decks
9%synergy
Temple of Enlightenment
12%inclusion4 decks34 decks
-5%synergy
Shineshadow Snarl
12%inclusion4 decks34 decks
1%synergy